JP6524591B2 - Cutting insert and face milling cutter - Google Patents

Description

  The present invention relates to a cutting insert and a face milling cutter using the same.

  In cutting of a soft material typified by aluminum, a cutting insert using single crystal diamond or the like as a cutting edge is used.

  A cutting insert having a cutting edge of single crystal diamond exhibits excellent adhesion resistance in processing of aluminum or the like, and enables high speed cutting.

  However, in the processing of a soft material such as aluminum by a face milling cutter, it is a problem that burrs are generated at the intersection (corner) of the side surface of the work with which the cutter is cut off and the processing surface.

  The burrs can be suppressed by reducing the thickness of chips and enhancing the sharpness of the cutter.

  Among these, the sharpness of the cutter can be enhanced by setting the axial rake or radial rake to a positive angle.

  In addition, the chip thickness becomes thinner if the cutter feed at the time of processing is made smaller, but since the processing efficiency is reduced by this method, the main cutting edge parallel to the tool axis is another method for reducing the chip thickness. Generally, chamfering called a chamfer is performed to the tip (between the Saraue blade which levels a processing surface), and (refer to the following patent documents 1).

Unexamined-Japanese-Patent No. 8-141822

  As described above, when a chamfer is attached to the leading edge of the main cutting edge (between the flat blade and the smoothing blade), the milling cutter using a brittle material such as diamond on the cutting edge is particularly the main cutting edge and It becomes easy to chip near the intersection of a chamfer part.

  In addition, in the processing in which the axial direction cutting is enlarged, the chips scraped off by the main cutting edge are discharged without being divided well and bite around the Saraue blade, which causes the cutting edge to be damaged or the processing surface May be hurt.

  An object of the present invention is to increase the strength of a corner formed on a cutting edge of a cutting insert, while suppressing burrs and improving chip discharge performance in soft material processing using a face milling cutter.

  The cutting insert according to one aspect of the present invention is for a face milling cutter, and has a cutting edge formed by intersecting ridges of a rake surface and a side surface, and the cutting edge is a main cutting edge, a salare blade, and its main It has a chamfer blade which is disposed between the cutting edge and the sarae blade.

The cutting edge of the cutting insert has a ratio L2: L3 = 2: 8 of the length L2 of the setting area of the chamfer edge and the length L3 of the setting area of the main cutting edge in the view of the side face of the side of the saraee. In the case where the inclination angle θ ₁ of the chamfer blade with respect to the salare blade and the inclination angle θ _{2 of the} main cutting edge with the sarare blade of the chamfer blade are set to a relation of θ ₁ <θ ₂ It has become.

Such cutting inserts, Sarae blades on the front of the tool body, is arranged a main cutting edge to the outer periphery of the tool body, further, the tip outer periphery of the tool body in the position where the inclination angle theta ₂ is 45 ° to 80 ° Attach to

  The present invention also provides a face milling cutter having such a structure.

  In the cutting insert according to one aspect of the present invention, burrs in processing of a soft material are suppressed, and chip dischargeability is also improved.

  In addition, the strength of the corner where the Saraue blade and the chamfer edge cross each other is enhanced, and the loss of the corner is suppressed.

It is a perspective view showing a cutting insert concerning one mode of the present invention. It is a front view of the cutting insert of FIG. It is a side view of the cutting insert of FIG. It is a front view of the cutting insert of FIG. It is a rear view of the cutting insert of FIG. It is a figure which expands and shows a part of FIG. It is a perspective view which shows an example of the face milling cutter using the cutting insert of FIG. It is a side view of the face milling cutter of FIG. It is a front view of the face milling cutter of FIG. It is a figure (The photograph which shows the corner property on the cutter cut-off side of a workpiece | work) which shows the relationship between inclination-angle (theta) ₁ of a chamfer blade, and the generation | occurrence | production condition of a burr | flash and a corner chip. It is a figure which shows the relationship between the inclination angle (theta) ₂ of a main cutting edge, and the processing condition of chips. It is the graph which put together the evaluation result of the relationship between inclination-angle (theta) ₁ of a chamfer edge, and inclination-angle (theta) ₂ of a main cutting edge.

Description of the embodiment of the present invention
A cutting insert according to one aspect of the present invention is a cutting insert for a face milling cutter, which has a cutting edge formed by intersecting ridges of a rake surface and a side surface, and the cutting edge is a main cutting edge, sarae A blade and a chamfer blade disposed between the main cutting edge thereof and the Saraye blade.

  The ratio of the installation area length L2 of the chamfer blade to the installation area length L3 of the main cutting edge in the figure directly looking at the side face of the Saraue blade side is L2: L3 = 2: 8 to 5: 5. The length of the installation area of the chamfer and main cutting edges referred to here is shorter than the actual size of the cutting edges.

Further, the inclination angle (hereinafter simply referred to as inclination angle) θ ₁ of the chamfer blade to the sarae blade and the inclination angle θ ₂ of the main cutting edge to the sarare blade are set to a relation of θ ₁ <θ ₂ ing. The inclination angle is preferably θ ₁ = 10 ° to 30 °, θ ₂ = 45 ° to 80 ° as a preferable numerical value.

  Note that a view in which the side face on the side of the saraye blade is viewed directly refers to a view in which the side face on the side of the sarahe blade is viewed in the cutter axial direction in a state where the cutting insert is attached to the cutter body.

Further, the tilt angle theta ₁ and theta ₂ are face angle in the use state is an angle relative to the Sarae blades 0 ° (the axis perpendicular of the cutter).

  In the cutting insert which satisfies the above-mentioned relationship, the chamfering blade suppresses burrs on the work goby side while functioning as a part of the main cutting edge.

The inclination angle theta ₁ of the chamfer edge is to the inclination angle theta ₁ is 30 ° because the cause of burrs and frittering of the work corners in the 45 ° to excessive too cutter weathered side (defect) or less Is good.

Further, chamfering blades by the inclination angle theta ₁ to 10 ° or more to function effectively. By these actions, in the case of inclination angle θ ₁ = 10 ° to 30 °, burrs and edge chipping are suppressed, and a machined surface with good properties can be obtained.

  When the above relationship is satisfied, the cutter axial length L4 of the cutting edge consisting of the main cutting edge and the chamfer edge and the cutter radial length (L2 + L3) of the cutting edge consisting of the two {L4 The relationship of> (L 2 + L 3)} is established, and it is possible to cope with a large machining of the axial notch.

Furthermore, by setting the inclination angle θ ₁ of the chamfer blade to 10 ° to 30 ° and the inclination angle θ ₂ of the main cutting edge to 45 ° to 80 ° respectively, the corner C where the chamfer edge and the main cutting edge intersected Corner angle (the angle between the chamfer edge and the main cutting edge) θ3 is 110 ° or more. Therefore, the corner C is strengthened, the fracture resistance of the corner is increased, and the durability is improved.

In addition, by making the inclination angle theta ₂ of the main cutting edge to 45 ° or more, in the direction of the outflow direction of the chips is separated from the working surface, and further, in comparison with cutting inserts of the inclination angle θ _{2 =} 90 ° The diameter of the chip scraped and curled by the main cutting edge becomes smaller and the chips are finely divided.

  As a result, biting of chips in the vicinity of the Saraye blade is less likely to occur, and damage to the cutting edge and damage to the machined surface due to biting of the chips is also suppressed.

Further, by making the inclination angle theta ₂ of the main cutting edge to less than 80 °, the thickness of the chips to be processed into the main edge becomes thinner than the chip thickness by the cutting edge of θ _{2 =} 90 °. Chamfer blades is also similar, if an inclined angle theta ₁ of the chamfer edge is set to tentatively 25 °, the chip thickness is reduced to about 80% compared to the cutting edge of θ _{2 =} 90 °. For this reason, the cutting principal force is reduced and the cutting resistance is reduced.

Details of the Embodiment of the Present Invention
Hereinafter, specific examples of the cutting insert and the face milling cutter according to the embodiment of the present invention will be described with reference to FIGS. 1 to 9 of the attached drawings.

  Specific examples of the cutting insert according to one aspect of the present invention will be described below with reference to the drawings. The present invention is not limited to these examples, but is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

  The cutting insert 1 shown in FIGS. 1 to 6 is configured by bonding a single-crystal diamond or a cutting edge tip 3 of a diamond sintered body (PCD) to one corner of the upper surface of the base metal 2.

  The cutting tip 4 is provided with a cutting edge 4. As shown in detail in FIG. 6, the cutting edge 4 formed by the intersecting ridges of the rake face 5 and the side surface 6 is composed of a main cutting edge 4a, a chamfered blade 4b and a Saraye blade 4c.

Theta ₁ (tilt angle relative to the surface to be processed into = Sarae blades) inclination angle with respect Sarae blade 4c of the chamfer edge 4b is set to 10 ° to 30 °.

The inclination angle theta ₂ of the main cutting edge 4a for face angle = 0 ° of Sarae blade 4c is set to 45 ° to 80 °, the corner angle of the corner C where the chamfer edge 4b and the main cutting edge 4a is intersected theta ₃ is 110 degrees or more. Therefore, chipping of the corner C is suppressed.

  The main cutting edge 4a and the chamfering blade 4b have a length L2 of the installation area length of the chamfering blade 4b in a view (a view from the arrow A direction in FIG. 6) in which the side face on the Saraue blade 4c side is directly viewed in the cutter axial direction The ratio L2: L3 of the two is set to 2: 8 to 5: 5, where L3 is the installation area length of the cutting edge 4a.

  When L2 is smaller than L2: L2 = 2: 8 and L3 is larger, the effect of suppressing burrs in the chamfer blade 4b is reduced, so that the burrs can not be efficiently suppressed.

When L2 is larger than L2: L3 = 5: 5 and L3 is small, the influence of chips of the chamfer blade 4b in the discharge direction becomes large, so that a problem occurs that chips are discharged without being divided.

  With the above settings, the cutter axial length L4 of the cutting edge consisting of the main cutting edge 4a and the chamfer blade 4b and the cutter radial length (L2 + L3) of the cutting edge are {L4> (L2 + L3)} Relationship is established.

  Further, the installation area length L1 of the Saraue blade 4c in the arrow A direction view in FIG. 6 is a length such that the relationship of {L1> (L2 + L3)} holds, and for that reason, the processing completed by the Saraue blade 4c The surface roughness of the surface can be enhanced.

  Although the sara blade 4c of the illustrated cutting insert is a straight blade with a face angle of 0 °, the sara blade 4c is a blade with a face angle or a blade curved in a convex arc shape I don't care. For a cutting insert having such a sara blade, the sara blade is considered as a blade with a face angle of 0 °, and the inclination angles of the chamfer and the main cutting edge are set.

  Next, a specific example of a face milling cutter according to an embodiment of the present invention using the above-mentioned cutting insert 1 will be described based on FIGS. 7 to 9 of the attached drawings.

  The illustrated face milling cutter 10 includes a tool body 11, a cutting insert 1, a clamp mechanism 12 and an edge adjustment mechanism 13.

  In the tool main body 11, a plurality of insert support seats 14 for supporting the cutting insert 1 and a plurality of chip pockets 15 facing the insert support seats are provided on the outer periphery at a constant pitch in the circumferential direction.

In the cutting insert 1, the Saraue blade 4c is disposed on the front surface of the tool body 11, and the main cutting edge 4a is disposed on the outer periphery of the tool body 11, and the main cutting edge 4a is θ with respect to a line perpendicular to the axis of the cutter. It is mounted on the insert support seat 14 provided on the outer periphery of the tip of the tool body 11 in a posture having an inclination of ₂ .

  Then, it is fixed to the tool main body 11 by the clamp mechanism 12. The clamp mechanism 12 has a hook-like clamp piece 12a and a clamp screw 12c for drawing it into the wedge groove 12b (in the figure, one end side screwed into the tool body 11 and the other end side screwed into the clamp piece 12a are reverse screwed This is a known mechanism combining so-called W screws).

  The shake adjustment mechanism 13 is configured by an adjustment screw 13 a screwed into the tool main body 11 from the side with the insert support seat 14.

  The adjustment screw 13a is a screw in which pin holes for engaging a pin spanner (not shown) for rotational operation are provided at a constant pitch in the circumferential direction on the outer periphery of the head. The adjustment screw 13 a is disposed rearward of the insert support seat 14.

  The cutting insert 1 seated on the insert support seat 14 is abutted against the top surface of the adjusting screw 13a, and the screwing amount of the adjusting screw 13a with respect to the tool main body 11 is increased or decreased. I try to align the

  In the face milling cutter 10 configured in this way, the adoption of the above-described cutting insert 1 makes it possible to suppress burrs and improve the chip dischargeability of the cutter cut-out portion of the processing surface, and also to the cutting edge. The strength of the corner portion to be formed is also enhanced, and improvement in durability, improvement in stability of processing, and improvement in quality of the processed surface can be expected.

The results of evaluation tests on the inclination angle θ ₁ of the chamfer blade and the inclination angle θ ₂ of the main cutting edge are described below.

-Test 1-
The relationship between the size of the inclination angle θ ₁ of the chamfer blade and the occurrence of burrs and chipping was examined under the following conditions.
Evaluation equipment: Vertical machining center evaluation tool with a BT30 main spindle Evaluation tool: RF4080R manufactured by Sumitomo Electric Hardmetal Corp. (number of blades = 1)
Cutting insert: 4 types (no cutting edge with inclination angle θ ₂ ) in which the inclination angle θ ₁ of the chamfer edge contained in the cutting edge tip of single crystal diamond is set to 10 °, 20 °, 45 ° and 75 °.
Work material: AC 4 C-T 5 (50 mm wide aluminum alloy)
Cutting conditions: Cutting speed Vc = 1000 m / min and 2300 m / min, feed amount per blade fz = 0.15 mm, cutting depth ap = 0.5 mm, cutting width ae = 50 mm, wet cutting

The results of this evaluation test are shown in FIG. FIG. 10 is a diagram obtained by photographing the corner on the cutter through side of the processed work with a camera and tracing the image of the obtained enlarged photograph. FIG As can be seen from the inclination angle theta ₁ is 45 ° chamfer edge, the 75 °, burrs and frittering occurs in cutter survive the side corners of the machined surface of the workpiece W.

Burr and frittering is a remarkable larger the inclination angle theta _1. In contrast, the inclination angle theta ₁ of the chamfer edge is 10 °, the 20 °, the cutter survived the side corners of the machined surface of the workpiece W has good properties with no burrs and frittering is ensured.

-Test 2-
And the inclination angle theta ₂ of the size of the main cutting edge, the relationship between the processing status of the chip was investigated under the following conditions.
Evaluation equipment: Vertical machining center evaluation tool with BT30 main spindle Evaluation tool: Sumitomo Electric Hardmetal Co., Ltd. cutter (tool in Fig. 7)
Cutting inserts: Two types in which the inclination angle θ ₂ of the main cutting edge included in the cutting edge tip of single crystal diamond is set to 45 ° and 75 ° (no cutting edge with inclination angle θ ₁ ).
Work material: ACD12
Cutting conditions: Cutting speed Vc = 2261 m / min (n = 9000 min- ¹ ), feed amount per blade fz = 0.15 mm, cutting depth ap = 0.4 mm, cutting width ae = 50 mm, number of blades: 1 sheet , Dry cutting (made dry for shooting)

The results of this evaluation test are shown in FIG. At an inclination angle θ ₂ = 45 ° of the main cutting edge, the chips are favorably curled and finely divided, but at an inclination angle θ ₂ = 75 °, chips extending in a nearly straight state are generated.

In addition, it is set as n = 1000min < ^-1 > for the photography of the real process of FIG. 11 for imaging | photography. In the photograph, since the shape of the chips and the outflow direction are not clear, a diagram schematically showing the shape and the outflow direction is also shown in FIG.

  The evaluation results of Tests 1 and 2 are summarized in FIG.

-Test 3-
And the inclination angle theta ₂ of the size of the main cutting edge, the relationship between the processing status of the chip was investigated under the following conditions.
Evaluation equipment: Vertical machining center evaluation tool with BT30 main spindle Evaluation tool: Sumitomo Electric Hardmetal Co., Ltd. cutter (tool in Fig. 7)
Cutting insert: the inclination angle θ _{1 of the} chamfered blade included in the cutting edge tip of single crystal diamond θ ₁ = 10 °, the inclination angle θ _{1 of the} chamfered blade of one type set to L2: L2 = 2: 8, 20 °, L2: Another one set to L3 = 5: 5. Inclination angle theta ₂ of the main cutting edge is set to either 45 °.
Work material: ACD12
Cutting conditions: Cutting speed Vc = 2261 m / min (n = 9000 min- ¹ ), feed amount per blade fz = 0.15 mm, cutting depth ap = 0.4 mm, cutting width ae = 50 mm, number of blades: 1 sheet ,

In all cutting inserts, chips are favorably curled and finely divided, and the corner on the cutting edge side of the machined surface of the workpiece W has good characteristics free of burrs and chipping.

DESCRIPTION OF SYMBOLS 1 cutting insert 2 base metal 3 cutting edge tip 4 cutting edge 4a main cutting edge 4b chamfer blade 4c sarae blade 5 rake face 6 side θ ₁ chamfer angle of bevel groove θ ₂ inclination angle of main cutting edge C chamfer edge and main installation of chamfer edge in diagram look into the side of the installation area length L2 Sarae blade side Sarae blade in FIG side to face up to the corner angle L1 Sarae edge side corner position cutting edge intersects theta ₃ corners C Area length L3 Installation area of the main cutting edge L4 in a view of the side of the sara blade side in a straight view. Cutting direction of the cutting edge Installation area length 10 Front milling cutter 11 Tool body 12 Clamping mechanism 12a Clamping piece 12b Wedge groove 12c Clamp screw 13 Blade runout adjustment mechanism 13a Adjustment screw 14 Insert support seat 15 Chip pocket

Claims (1)

A face milling cutter having a cutting edge formed by intersecting ridges of a rake face and a side, the cutting edge comprising a main cutting edge, a sarae blade and a chamfering blade disposed between the main cutting edge and the sarae blade A face milling cutter with a cutting insert for the cutter, wherein
The ratio of the installation area length L2 of the chamfer blade to the installation area length L3 of the main cutting edge in the view directly looking at the side face of the Saraye blade is set to L2: L3 = 2: 8 to 5: 5, and An inclination angle θ ₁ of the chamfer blade with respect to the salare blade and an inclination angle θ _{2 of the} main cutting blade with respect to the salare blade are set in a relationship of θ ₁ <θ ₂ ;
The material of the cutting edge is single crystal diamond or a diamond sintered body,
Inclination angle θ _{1 of the} chamfer blade with respect to the sara blade: θ ₁ = 10 ° to 30 °, inclination angle of the main cutting edge with respect to the sara blade: θ ₂ = 45 ° to 80 °; the chamfer blade and the main cutting edge The corner angle θ ₃ of the crossed corner is 110 ° or more,
Assuming that the length of the installation area of the Saraue blade in the figure in which the side surface of the Saraue blade side is directly viewed is L1, the condition of L1> (L2 + L3) is satisfied.
The cutting insert has a substantially rectangular shape, one side of the cutting insert is located at the tip of the tool body, the sara blade is located in front of the tool body, and the main cutting edge is located on the outer periphery of the tool body, And, the face milling cutter wherein the cutting insert is mounted on the outer periphery of the tip of the tool body in a posture in which the main cutting edge has an inclination of 45 ° to 80 ° with respect to a line perpendicular to the axis of the cutter.

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